/*
 * libev native API header
 *
 * Copyright (c) 2007,2008,2009,2010,2011,2012,2015 Marc Alexander Lehmann
 * <libev@schmorp.de> All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 *
 *   1.  Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *
 *   2.  Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License ("GPL") version 2 or any later version,
 * in which case the provisions of the GPL are applicable instead of
 * the above. If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the BSD license, indicate your decision
 * by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL. If you do not delete the
 * provisions above, a recipient may use your version of this file under
 * either the BSD or the GPL.
 */

#ifndef EV_H_
#define EV_H_

#ifndef WARNING_MSG
#error "DO NOT include ev.h directly, instead of include event_loop.h"
#endif

#ifdef __cplusplus
#define EV_CPP( x ) x
#if __cplusplus >= 201103L
#define EV_THROW noexcept
#else
#define EV_THROW throw( )
#endif
#else
#define EV_CPP( x )
#define EV_THROW
#endif

EV_CPP( extern "C" {)

/*****************************************************************************/

/* pre-4.0 compatibility */
#ifndef EV_COMPAT3
#define EV_COMPAT3 1
#endif

#ifndef EV_FEATURES
#if defined __OPTIMIZE_SIZE__
#define EV_FEATURES 0x7c
#else
#define EV_FEATURES 0x7f
#endif
#endif

#define EV_FEATURE_CODE     ( ( EV_FEATURES ) & 1 )
#define EV_FEATURE_DATA     ( ( EV_FEATURES ) & 2 )
#define EV_FEATURE_CONFIG   ( ( EV_FEATURES ) & 4 )
#define EV_FEATURE_API      ( ( EV_FEATURES ) & 8 )
#define EV_FEATURE_WATCHERS ( ( EV_FEATURES ) & 16 )
#define EV_FEATURE_BACKENDS ( ( EV_FEATURES ) & 32 )
#define EV_FEATURE_OS       ( ( EV_FEATURES ) & 64 )

/* these priorities are inclusive, higher priorities will be invoked earlier */
#ifndef EV_MINPRI
#define EV_MINPRI ( EV_FEATURE_CONFIG ? -2 : 0 )
#endif
#ifndef EV_MAXPRI
#define EV_MAXPRI ( EV_FEATURE_CONFIG ? +2 : 0 )
#endif

#ifndef EV_MULTIPLICITY
#define EV_MULTIPLICITY EV_FEATURE_CONFIG
#endif

#ifndef EV_PERIODIC_ENABLE
#define EV_PERIODIC_ENABLE EV_FEATURE_WATCHERS
#endif

#ifndef EV_STAT_ENABLE
#define EV_STAT_ENABLE EV_FEATURE_WATCHERS
#endif

#ifndef EV_PREPARE_ENABLE
#define EV_PREPARE_ENABLE EV_FEATURE_WATCHERS
#endif

#ifndef EV_CHECK_ENABLE
#define EV_CHECK_ENABLE EV_FEATURE_WATCHERS
#endif

#ifndef EV_IDLE_ENABLE
#define EV_IDLE_ENABLE EV_FEATURE_WATCHERS
#endif

#ifndef EV_FORK_ENABLE
#define EV_FORK_ENABLE EV_FEATURE_WATCHERS
#endif

#ifndef EV_CLEANUP_ENABLE
#define EV_CLEANUP_ENABLE EV_FEATURE_WATCHERS
#endif

#ifndef EV_SIGNAL_ENABLE
#define EV_SIGNAL_ENABLE EV_FEATURE_WATCHERS
#endif

#ifndef EV_CHILD_ENABLE
#ifdef _WIN32
#define EV_CHILD_ENABLE 0
#else
#define EV_CHILD_ENABLE EV_FEATURE_WATCHERS
#endif
#endif

#ifndef EV_ASYNC_ENABLE
#define EV_ASYNC_ENABLE EV_FEATURE_WATCHERS
#endif

#ifndef EV_EMBED_ENABLE
#define EV_EMBED_ENABLE EV_FEATURE_WATCHERS
#endif

#ifndef EV_WALK_ENABLE
#define EV_WALK_ENABLE 0 /* not yet */
#endif

  /*****************************************************************************/

#if EV_CHILD_ENABLE && !EV_SIGNAL_ENABLE
#undef EV_SIGNAL_ENABLE
#define EV_SIGNAL_ENABLE 1
#endif

/*****************************************************************************/

typedef double ev_tstamp;

#include <string.h> /* for memmove */

#ifndef EV_ATOMIC_T
#include <signal.h>
#define EV_ATOMIC_T sig_atomic_t volatile
#endif

#if EV_STAT_ENABLE
#ifdef _WIN32
#include <time.h>
#include <sys/types.h>
#endif
#include <sys/stat.h>
#endif

/* support multiple event loops? */
#if EV_MULTIPLICITY
  struct ev_loop;
#define EV_P \
  struct ev_loop* loop /* a loop as sole parameter in a declaration */
#define EV_P_ EV_P,    /* a loop as first of multiple parameters */
#define EV_A  loop     /* a loop as sole argument to a function call */
#define EV_A_ EV_A,    /* a loop as first of multiple arguments */
#define EV_DEFAULT_UC \
  ev_default_loop_uc_( ) /* the default loop, if initialised, as sole arg */
#define EV_DEFAULT_UC_ \
  EV_DEFAULT_UC, /* the default loop as first of multiple arguments */
#define EV_DEFAULT ev_default_loop( 0 ) /* the default loop as sole arg */
#define EV_DEFAULT_ \
  EV_DEFAULT, /* the default loop as first of multiple arguments */
#else
#define EV_P void
#define EV_P_
#define EV_A
#define EV_A_
#define EV_DEFAULT
#define EV_DEFAULT_
#define EV_DEFAULT_UC
#define EV_DEFAULT_UC_
#undef EV_EMBED_ENABLE
#endif

/* EV_INLINE is used for functions in header files */
#if __STDC_VERSION__ >= 199901L || __GNUC__ >= 3
#define EV_INLINE static inline
#else
#define EV_INLINE static
#endif

#ifdef EV_API_STATIC
#define EV_API_DECL static
#else
#define EV_API_DECL extern
#endif

/* EV_PROTOTYPES can be used to switch of prototype declarations */
#ifndef EV_PROTOTYPES
#define EV_PROTOTYPES 1
#endif

  /*****************************************************************************/

#define EV_VERSION_MAJOR 4
#define EV_VERSION_MINOR 22

  /* eventmask, revents, events... */
  enum {
    EV_UNDEF    = ( int )0xFFFFFFFF, /* guaranteed to be invalid */
    EV_NONE     = 0x00,              /* no events */
    EV_READ     = 0x01,              /* ev_io detected read will not block */
    EV_WRITE    = 0x02,              /* ev_io detected write will not block */
    EV__IOFDSET = 0x80,              /* internal use only */
    EV_IO       = EV_READ,           /* alias for type-detection */
    EV_TIMER    = 0x00000100,        /* timer timed out */
#if EV_COMPAT3
    EV_TIMEOUT = EV_TIMER, /* pre 4.0 API compatibility */
#endif
    EV_PERIODIC = 0x00000200,       /* periodic timer timed out */
    EV_SIGNAL   = 0x00000400,       /* signal was received */
    EV_CHILD    = 0x00000800,       /* child/pid had status change */
    EV_STAT     = 0x00001000,       /* stat data changed */
    EV_IDLE     = 0x00002000,       /* event loop is idling */
    EV_PREPARE  = 0x00004000,       /* event loop about to poll */
    EV_CHECK    = 0x00008000,       /* event loop finished poll */
    EV_EMBED    = 0x00010000,       /* embedded event loop needs sweep */
    EV_FORK     = 0x00020000,       /* event loop resumed in child */
    EV_CLEANUP  = 0x00040000,       /* event loop resumed in child */
    EV_ASYNC    = 0x00080000,       /* async intra-loop signal */
    EV_CUSTOM   = 0x01000000,       /* for use by user code */
    EV_ERROR    = ( int )0x80000000 /* sent when an error occurs */
  };

/* can be used to add custom fields to all watchers, while losing binary
 * compatibility */
#ifndef EV_COMMON
#define EV_COMMON void* data;
#endif

#ifndef EV_CB_DECLARE
#define EV_CB_DECLARE( type ) \
  void ( *cb )( EV_P_ struct type * w, int revents );
#endif
#ifndef EV_CB_INVOKE
#define EV_CB_INVOKE( watcher, revents ) \
  ( watcher )->cb( EV_A_( watcher ), ( revents ) )
#endif

/* not official, do not use */
#define EV_CB( type, name ) void name( EV_P_ struct ev_##type* w, int revents )

  /*
   * struct member types:
   * private: you may look at them, but not change them,
   *          and they might not mean anything to you.
   * ro: can be read anytime, but only changed when the watcher isn't active.
   * rw: can be read and modified anytime, even when the watcher is active.
   *
   * some internal details that might be helpful for debugging:
   *
   * active is either 0, which means the watcher is not active,
   *           or the array index of the watcher (periodics, timers)
   *           or the array index + 1 (most other watchers)
   *           or simply 1 for watchers that aren't in some array.
   * pending is either 0, in which case the watcher isn't,
   *           or the array index + 1 in the pendings array.
   */

#if EV_MINPRI == EV_MAXPRI
#define EV_DECL_PRIORITY
#elif !defined( EV_DECL_PRIORITY )
#define EV_DECL_PRIORITY int priority;
#endif

/* shared by all watchers */
#define EV_WATCHER( type )              \
  int active;             /* private */ \
  int pending;            /* private */ \
  EV_DECL_PRIORITY        /* private */ \
    EV_COMMON             /* rw */      \
    EV_CB_DECLARE( type ) /* private */

#define EV_WATCHER_LIST( type ) \
  EV_WATCHER( type )            \
  struct ev_watcher_list* next; /* private */

#define EV_WATCHER_TIME( type ) \
  EV_WATCHER( type )            \
  ev_tstamp at; /* private */

  /* base class, nothing to see here unless you subclass */
  typedef struct ev_watcher {
    EV_WATCHER( ev_watcher )
  } ev_watcher;

  /* base class, nothing to see here unless you subclass */
  typedef struct ev_watcher_list {
    EV_WATCHER_LIST( ev_watcher_list )
  } ev_watcher_list;

  /* base class, nothing to see here unless you subclass */
  typedef struct ev_watcher_time {
    EV_WATCHER_TIME( ev_watcher_time )
  } ev_watcher_time;

  /* invoked when fd is either EV_READable or EV_WRITEable */
  /* revent EV_READ, EV_WRITE */
  typedef struct ev_io {
    EV_WATCHER_LIST( ev_io )

    int fd;     /* ro */
    int events; /* ro */
  } ev_io;

  /* invoked after a specific time, repeatable (based on monotonic clock) */
  /* revent EV_TIMEOUT */
  typedef struct ev_timer {
    EV_WATCHER_TIME( ev_timer )

    ev_tstamp repeat; /* rw */
  } ev_timer;

  /* invoked at some specific time, possibly repeating at regular intervals
   * (based on UTC) */
  /* revent EV_PERIODIC */
  typedef struct ev_periodic {
    EV_WATCHER_TIME( ev_periodic )

    ev_tstamp offset;   /* rw */
    ev_tstamp interval; /* rw */
    ev_tstamp ( *reschedule_cb )( struct ev_periodic* w,
                                  ev_tstamp           now ) EV_THROW; /* rw */
  } ev_periodic;

  /* invoked when the given signal has been received */
  /* revent EV_SIGNAL */
  typedef struct ev_signal {
    EV_WATCHER_LIST( ev_signal )

    int signum; /* ro */
  } ev_signal;

  /* invoked when sigchld is received and waitpid indicates the given pid */
  /* revent EV_CHILD */
  /* does not support priorities */
  typedef struct ev_child {
    EV_WATCHER_LIST( ev_child )

    int flags;   /* private */
    int pid;     /* ro */
    int rpid;    /* rw, holds the received pid */
    int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
  } ev_child;

#if EV_STAT_ENABLE
/* st_nlink = 0 means missing file or other error */
#ifdef _WIN32
  typedef struct _stati64 ev_statdata;
#else
typedef struct stat ev_statdata;
#endif

  /* invoked each time the stat data changes for a given path */
  /* revent EV_STAT */
  typedef struct ev_stat {
    EV_WATCHER_LIST( ev_stat )

    ev_timer    timer;    /* private */
    ev_tstamp   interval; /* ro */
    const char* path;     /* ro */
    ev_statdata prev;     /* ro */
    ev_statdata attr;     /* ro */

    int         wd; /* wd for inotify, fd for kqueue */
  } ev_stat;
#endif

#if EV_IDLE_ENABLE
  /* invoked when the nothing else needs to be done, keeps the process from
   * blocking */
  /* revent EV_IDLE */
  typedef struct ev_idle {
    EV_WATCHER( ev_idle )
  } ev_idle;
#endif

  /* invoked for each run of the mainloop, just before the blocking call */
  /* you can still change events in any way you like */
  /* revent EV_PREPARE */
  typedef struct ev_prepare {
    EV_WATCHER( ev_prepare )
  } ev_prepare;

  /* invoked for each run of the mainloop, just after the blocking call */
  /* revent EV_CHECK */
  typedef struct ev_check {
    EV_WATCHER( ev_check )
  } ev_check;

#if EV_FORK_ENABLE
  /* the callback gets invoked before check in the child process when a fork was
   * detected */
  /* revent EV_FORK */
  typedef struct ev_fork {
    EV_WATCHER( ev_fork )
  } ev_fork;
#endif

#if EV_CLEANUP_ENABLE
  /* is invoked just before the loop gets destroyed */
  /* revent EV_CLEANUP */
  typedef struct ev_cleanup {
    EV_WATCHER( ev_cleanup )
  } ev_cleanup;
#endif

#if EV_EMBED_ENABLE
  /* used to embed an event loop inside another */
  /* the callback gets invoked when the event loop has handled events, and can
   * be 0 */
  typedef struct ev_embed {
    EV_WATCHER( ev_embed )

    struct ev_loop* other;    /* ro */
    ev_io           io;       /* private */
    ev_prepare      prepare;  /* private */
    ev_check        check;    /* unused */
    ev_timer        timer;    /* unused */
    ev_periodic     periodic; /* unused */
    ev_idle         idle;     /* unused */
    ev_fork         fork;     /* private */
#if EV_CLEANUP_ENABLE
    ev_cleanup cleanup; /* unused */
#endif
  } ev_embed;
#endif

#if EV_ASYNC_ENABLE
  /* invoked when somebody calls ev_async_send on the watcher */
  /* revent EV_ASYNC */
  typedef struct ev_async {
    EV_WATCHER( ev_async )

    EV_ATOMIC_T sent; /* private */
  } ev_async;

#define ev_async_pending( w ) ( +( w )->sent )
#endif

  /* the presence of this union forces similar struct layout */
  union ev_any_watcher {
    struct ev_watcher      w;
    struct ev_watcher_list wl;

    struct ev_io           io;
    struct ev_timer        timer;
    struct ev_periodic     periodic;
    struct ev_signal       signal;
    struct ev_child        child;
#if EV_STAT_ENABLE
    struct ev_stat stat;
#endif
#if EV_IDLE_ENABLE
    struct ev_idle idle;
#endif
    struct ev_prepare prepare;
    struct ev_check   check;
#if EV_FORK_ENABLE
    struct ev_fork fork;
#endif
#if EV_CLEANUP_ENABLE
    struct ev_cleanup cleanup;
#endif
#if EV_EMBED_ENABLE
    struct ev_embed embed;
#endif
#if EV_ASYNC_ENABLE
    struct ev_async async;
#endif
  };

  /* flag bits for ev_default_loop and ev_loop_new */
  enum {
    /* the default */
    EVFLAG_AUTO = 0x00000000U, /* not quite a mask */
    /* flag bits */
    EVFLAG_NOENV     = 0x01000000U, /* do NOT consult environment */
    EVFLAG_FORKCHECK = 0x02000000U, /* check for a fork in each iteration */
    /* debugging/feature disable */
    EVFLAG_NOINOTIFY = 0x00100000U, /* do not attempt to use inotify */
#if EV_COMPAT3
    EVFLAG_NOSIGFD = 0, /* compatibility to pre-3.9 */
#endif
    EVFLAG_SIGNALFD  = 0x00200000U, /* attempt to use signalfd */
    EVFLAG_NOSIGMASK = 0x00400000U  /* avoid modifying the signal mask */
  };

  /* method bits to be ored together */
  enum {
    EVBACKEND_SELECT  = 0x00000001U,                 /* about anywhere */
    EVBACKEND_POLL    = 0x00000002U,                 /* !win */
    EVBACKEND_EPOLL   = 0x00000004U,                 /* linux */
    EVBACKEND_KQUEUE  = 0x00000008U,                 /* bsd */
    EVBACKEND_DEVPOLL = 0x00000010U, /* solaris 8 */ /* NYI */
    EVBACKEND_PORT    = 0x00000020U,                 /* solaris 10 */
    EVBACKEND_ALL     = 0x0000003FU,                 /* all known backends */
    EVBACKEND_MASK    = 0x0000FFFFU                  /* all future backends */
  };

#if EV_PROTOTYPES
  EV_API_DECL int          ev_version_major( void ) EV_THROW;
  EV_API_DECL int          ev_version_minor( void ) EV_THROW;

  EV_API_DECL unsigned int ev_supported_backends( void ) EV_THROW;
  EV_API_DECL unsigned int ev_recommended_backends( void ) EV_THROW;
  EV_API_DECL unsigned int ev_embeddable_backends( void ) EV_THROW;

  EV_API_DECL ev_tstamp    ev_time( void ) EV_THROW;
  EV_API_DECL void ev_sleep( ev_tstamp delay ) EV_THROW; /* sleep for a while */

  /* Sets the allocation function to use, works like realloc.
   * It is used to allocate and free memory.
   * If it returns zero when memory needs to be allocated, the library might
   * abort or take some potentially destructive action. The default is your
   * system realloc function.
   */
  EV_API_DECL void ev_set_allocator(
    void* ( *cb )( void* ptr, long size )EV_THROW ) EV_THROW;

  /* set the callback function to call on a
   * retryable syscall error
   * (such as failed select, poll, epoll_wait)
   */
  EV_API_DECL void ev_set_syserr_cb( void ( *cb )( const char* msg ) EV_THROW )
    EV_THROW;

#if EV_MULTIPLICITY

  /* the default loop is the only one that handles signals and child watchers */
  /* you can call this as often as you like */
  EV_API_DECL struct ev_loop* ev_default_loop(
    unsigned int flags EV_CPP( = 0 ) ) EV_THROW;

#ifdef EV_API_STATIC
  EV_API_DECL struct ev_loop* ev_default_loop_ptr;
#endif

  EV_INLINE struct ev_loop* ev_default_loop_uc_( void ) EV_THROW {
    extern struct ev_loop* ev_default_loop_ptr;

    return ev_default_loop_ptr;
  }

  EV_INLINE int ev_is_default_loop( EV_P ) EV_THROW {
    return EV_A == EV_DEFAULT_UC;
  }

  /* create and destroy alternative loops that don't handle signals */
  EV_API_DECL struct ev_loop* ev_loop_new( unsigned int flags EV_CPP( = 0 ) )
    EV_THROW;

  EV_API_DECL ev_tstamp ev_now( EV_P )
    EV_THROW; /* time w.r.t. timers and the eventloop, updated after each poll
               */

#else

EV_API_DECL int ev_default_loop (unsigned int flags EV_CPP (= 0)) EV_THROW; /* returns true when successful */

EV_API_DECL ev_tstamp ev_rt_now;

EV_INLINE ev_tstamp
ev_now (void) EV_THROW
{
  return ev_rt_now;
}

/* looks weird, but ev_is_default_loop (EV_A) still works if this exists */
EV_INLINE int
ev_is_default_loop (void) EV_THROW
{
  return 1;
}

#endif /* multiplicity */

  /* destroy event loops, also works for the default loop */
  EV_API_DECL void ev_loop_destroy( EV_P );

  /* this needs to be called after fork, to duplicate the loop */
  /* when you want to re-use it in the child */
  /* you can call it in either the parent or the child */
  /* you can actually call it at any time, anywhere :) */
  EV_API_DECL void         ev_loop_fork( EV_P ) EV_THROW;

  EV_API_DECL unsigned int ev_backend( EV_P )
    EV_THROW; /* backend in use by loop */

  EV_API_DECL void ev_now_update( EV_P ) EV_THROW; /* update event loop time */

#if EV_WALK_ENABLE
  /* walk (almost) all watchers in the loop of a given type, invoking the */
  /* callback on every such watcher. The callback might stop the watcher, */
  /* but do nothing else with the loop */
  EV_API_DECL void ev_walk( EV_P_ int types,
                            void ( *cb )( EV_P_ int type, void* w ) ) EV_THROW;
#endif

#endif /* prototypes */

  /* ev_run flags values */
  enum {
    EVRUN_NOWAIT = 1, /* do not block/wait */
    EVRUN_ONCE   = 2  /* block *once* only */
  };

  /* ev_break how values */
  enum {
    EVBREAK_CANCEL = 0, /* undo unloop */
    EVBREAK_ONE    = 1, /* unloop once */
    EVBREAK_ALL    = 2  /* unloop all loops */
  };

#if EV_PROTOTYPES
  EV_API_DECL int  ev_run( EV_P_ int flags EV_CPP( = 0 ) );
  EV_API_DECL void ev_break( EV_P_ int how EV_CPP( = EVBREAK_ONE ) )
    EV_THROW; /* break out of the loop */

  /*
   * ref/unref can be used to add or remove a refcount on the mainloop. every
   * watcher keeps one reference. if you have a long-running watcher you never
   * unregister that should not keep ev_loop from running, unref() after
   * starting, and ref() before stopping.
   */
  EV_API_DECL void ev_ref( EV_P ) EV_THROW;
  EV_API_DECL void ev_unref( EV_P ) EV_THROW;

  /*
   * convenience function, wait for a single event, without registering an event
   * watcher if timeout is < 0, do wait indefinitely
   */
  EV_API_DECL void ev_once( EV_P_ int fd,
                            int       events,
                            ev_tstamp timeout,
                            void ( *cb )( int revents, void* arg ),
                            void* arg ) EV_THROW;

#if EV_FEATURE_API
  EV_API_DECL unsigned int ev_iteration( EV_P )
    EV_THROW; /* number of loop iterations */
  EV_API_DECL unsigned int ev_depth( EV_P )
    EV_THROW; /* #ev_loop enters - #ev_loop leaves */
  EV_API_DECL void ev_verify( EV_P )
    EV_THROW; /* abort if loop data corrupted */

  EV_API_DECL void ev_set_io_collect_interval( EV_P_ ev_tstamp interval )
    EV_THROW; /* sleep at least this time, default 0 */
  EV_API_DECL void ev_set_timeout_collect_interval( EV_P_ ev_tstamp interval )
    EV_THROW; /* sleep at least this time, default 0 */

  /* advanced stuff for threading etc. support, see docs */
  EV_API_DECL void  ev_set_userdata( EV_P_ void* data ) EV_THROW;
  EV_API_DECL void* ev_userdata( EV_P ) EV_THROW;
  typedef void ( *ev_loop_callback )( EV_P );
  EV_API_DECL void ev_set_invoke_pending_cb(
    EV_P_ ev_loop_callback invoke_pending_cb ) EV_THROW;
  /* C++ doesn't allow the use of the ev_loop_callback typedef here, so we need
   * to spell it out */
  EV_API_DECL void ev_set_loop_release_cb(
    EV_P_ void ( *release )( EV_P ) EV_THROW,
    void ( *acquire )( EV_P ) EV_THROW ) EV_THROW;

  EV_API_DECL unsigned int ev_pending_count( EV_P )
    EV_THROW; /* number of pending events, if any */
  EV_API_DECL void ev_invoke_pending( EV_P ); /* invoke all pending watchers */

  /*
   * stop/start the timer handling.
   */
  EV_API_DECL void ev_suspend( EV_P ) EV_THROW;
  EV_API_DECL void ev_resume( EV_P ) EV_THROW;
#endif

#endif

/* these may evaluate ev multiple times, and the other arguments at most once */
/* either use ev_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first
 * initialise a watcher */
#define ev_init( ev, cb_ )                               \
  do {                                                   \
    ( ( ev_watcher* )( void* )( ev ) )->active           \
      = ( ( ev_watcher* )( void* )( ev ) )->pending = 0; \
    ev_set_priority( ( ev ), 0 );                        \
    ev_set_cb( ( ev ), cb_ );                            \
  } while ( 0 )

#define ev_io_set( ev, fd_, events_ )           \
  do {                                          \
    ( ev )->fd     = ( fd_ );                   \
    ( ev )->events = ( events_ ) | EV__IOFDSET; \
  } while ( 0 )
#define ev_timer_set( ev, after_, repeat_ )           \
  do {                                                \
    ( ( ev_watcher_time* )( ev ) )->at = ( after_ );  \
    ( ev )->repeat                     = ( repeat_ ); \
  } while ( 0 )
#define ev_periodic_set( ev, ofs_, ival_, rcb_ ) \
  do {                                           \
    ( ev )->offset        = ( ofs_ );            \
    ( ev )->interval      = ( ival_ );           \
    ( ev )->reschedule_cb = ( rcb_ );            \
  } while ( 0 )
#define ev_signal_set( ev, signum_ ) \
  do {                               \
    ( ev )->signum = ( signum_ );    \
  } while ( 0 )
#define ev_child_set( ev, pid_, trace_ ) \
  do {                                   \
    ( ev )->pid   = ( pid_ );            \
    ( ev )->flags = !!( trace_ );        \
  } while ( 0 )
#define ev_stat_set( ev, path_, interval_ ) \
  do {                                      \
    ( ev )->path     = ( path_ );           \
    ( ev )->interval = ( interval_ );       \
    ( ev )->wd       = -2;                  \
  } while ( 0 )
#define ev_idle_set( ev )    /* nop, yes, this is a serious in-joke */
#define ev_prepare_set( ev ) /* nop, yes, this is a serious in-joke */
#define ev_check_set( ev )   /* nop, yes, this is a serious in-joke */
#define ev_embed_set( ev, other_ ) \
  do {                             \
    ( ev )->other = ( other_ );    \
  } while ( 0 )
#define ev_fork_set( ev )    /* nop, yes, this is a serious in-joke */
#define ev_cleanup_set( ev ) /* nop, yes, this is a serious in-joke */
#define ev_async_set( ev )   /* nop, yes, this is a serious in-joke */

#define ev_io_init( ev, cb, fd, events )     \
  do {                                       \
    ev_init( ( ev ), ( cb ) );               \
    ev_io_set( ( ev ), ( fd ), ( events ) ); \
  } while ( 0 )
#define ev_timer_init( ev, cb, after, repeat )     \
  do {                                             \
    ev_init( ( ev ), ( cb ) );                     \
    ev_timer_set( ( ev ), ( after ), ( repeat ) ); \
  } while ( 0 )
#define ev_periodic_init( ev, cb, ofs, ival, rcb )         \
  do {                                                     \
    ev_init( ( ev ), ( cb ) );                             \
    ev_periodic_set( ( ev ), ( ofs ), ( ival ), ( rcb ) ); \
  } while ( 0 )
#define ev_signal_init( ev, cb, signum ) \
  do {                                   \
    ev_init( ( ev ), ( cb ) );           \
    ev_signal_set( ( ev ), ( signum ) ); \
  } while ( 0 )
#define ev_child_init( ev, cb, pid, trace )     \
  do {                                          \
    ev_init( ( ev ), ( cb ) );                  \
    ev_child_set( ( ev ), ( pid ), ( trace ) ); \
  } while ( 0 )
#define ev_stat_init( ev, cb, path, interval )     \
  do {                                             \
    ev_init( ( ev ), ( cb ) );                     \
    ev_stat_set( ( ev ), ( path ), ( interval ) ); \
  } while ( 0 )
#define ev_idle_init( ev, cb ) \
  do {                         \
    ev_init( ( ev ), ( cb ) ); \
    ev_idle_set( ( ev ) );     \
  } while ( 0 )
#define ev_prepare_init( ev, cb ) \
  do {                            \
    ev_init( ( ev ), ( cb ) );    \
    ev_prepare_set( ( ev ) );     \
  } while ( 0 )
#define ev_check_init( ev, cb ) \
  do {                          \
    ev_init( ( ev ), ( cb ) );  \
    ev_check_set( ( ev ) );     \
  } while ( 0 )
#define ev_embed_init( ev, cb, other ) \
  do {                                 \
    ev_init( ( ev ), ( cb ) );         \
    ev_embed_set( ( ev ), ( other ) ); \
  } while ( 0 )
#define ev_fork_init( ev, cb ) \
  do {                         \
    ev_init( ( ev ), ( cb ) ); \
    ev_fork_set( ( ev ) );     \
  } while ( 0 )
#define ev_cleanup_init( ev, cb ) \
  do {                            \
    ev_init( ( ev ), ( cb ) );    \
    ev_cleanup_set( ( ev ) );     \
  } while ( 0 )
#define ev_async_init( ev, cb ) \
  do {                          \
    ev_init( ( ev ), ( cb ) );  \
    ev_async_set( ( ev ) );     \
  } while ( 0 )

#define ev_is_pending( ev )                                          \
  ( 0                                                                \
    + ( ( ev_watcher* )( void* )( ev ) )                             \
        ->pending ) /* ro, true when watcher is waiting for callback \
                       invocation */
#define ev_is_active( ev )               \
  ( 0                                    \
    + ( ( ev_watcher* )( void* )( ev ) ) \
        ->active ) /* ro, true when the watcher has been started */

#define ev_cb_( ev ) ( ev )->cb /* rw */
#define ev_cb( ev )                          \
  ( memmove( &ev_cb_( ev ),                  \
             &( ( ev_watcher* )( ev ) )->cb, \
             sizeof( ev_cb_( ev ) ) ),       \
    ( ev )->cb )

#if EV_MINPRI == EV_MAXPRI
#define ev_priority( ev )          ( ( ev ), EV_MINPRI )
#define ev_set_priority( ev, pri ) ( ( ev ), ( pri ) )
#else
#define ev_priority( ev ) ( +( ( ( ev_watcher* )( void* )( ev ) )->priority ) )
#define ev_set_priority( ev, pri ) \
  ( ( ev_watcher* )( void* )( ev ) )->priority = ( pri )
#endif

#define ev_periodic_at( ev ) ( +( ( ev_watcher_time* )( ev ) )->at )

#ifndef ev_set_cb
#define ev_set_cb( ev, cb_ )                 \
  ( ev_cb_( ev ) = ( cb_ ),                  \
    memmove( &( ( ev_watcher* )( ev ) )->cb, \
             &ev_cb_( ev ),                  \
             sizeof( ev_cb_( ev ) ) ) )
#endif

/* stopping (enabling, adding) a watcher does nothing if it is already running
 */
/* stopping (disabling, deleting) a watcher does nothing unless it's already
 * running */
#if EV_PROTOTYPES

  /* feeds an event into a watcher as if the event actually occurred */
  /* accepts any ev_watcher type */
  EV_API_DECL void ev_feed_event( EV_P_ void* w, int revents ) EV_THROW;
  EV_API_DECL void ev_feed_fd_event( EV_P_ int fd, int revents ) EV_THROW;
#if EV_SIGNAL_ENABLE
  EV_API_DECL void ev_feed_signal( int signum ) EV_THROW;
  EV_API_DECL void ev_feed_signal_event( EV_P_ int signum ) EV_THROW;
#endif
  EV_API_DECL void ev_invoke( EV_P_ void* w, int revents );
  EV_API_DECL int  ev_clear_pending( EV_P_ void* w ) EV_THROW;

  EV_API_DECL void ev_io_start( EV_P_ ev_io * w ) EV_THROW;
  EV_API_DECL void ev_io_stop( EV_P_ ev_io * w ) EV_THROW;

  EV_API_DECL void ev_timer_start( EV_P_ ev_timer * w ) EV_THROW;
  EV_API_DECL void ev_timer_stop( EV_P_ ev_timer * w ) EV_THROW;
  /* stops if active and no repeat, restarts if active and repeating, starts if
   * inactive and repeating */
  EV_API_DECL void ev_timer_again( EV_P_ ev_timer * w ) EV_THROW;
  /* return remaining time */
  EV_API_DECL ev_tstamp ev_timer_remaining( EV_P_ ev_timer * w ) EV_THROW;

#if EV_PERIODIC_ENABLE
  EV_API_DECL void ev_periodic_start( EV_P_ ev_periodic * w ) EV_THROW;
  EV_API_DECL void ev_periodic_stop( EV_P_ ev_periodic * w ) EV_THROW;
  EV_API_DECL void ev_periodic_again( EV_P_ ev_periodic * w ) EV_THROW;
#endif

/* only supported in the default loop */
#if EV_SIGNAL_ENABLE
  EV_API_DECL void ev_signal_start( EV_P_ ev_signal * w ) EV_THROW;
  EV_API_DECL void ev_signal_stop( EV_P_ ev_signal * w ) EV_THROW;
#endif

/* only supported in the default loop */
#if EV_CHILD_ENABLE
  EV_API_DECL void ev_child_start( EV_P_ ev_child * w ) EV_THROW;
  EV_API_DECL void ev_child_stop( EV_P_ ev_child * w ) EV_THROW;
#endif

#if EV_STAT_ENABLE
  EV_API_DECL void ev_stat_start( EV_P_ ev_stat * w ) EV_THROW;
  EV_API_DECL void ev_stat_stop( EV_P_ ev_stat * w ) EV_THROW;
  EV_API_DECL void ev_stat_stat( EV_P_ ev_stat * w ) EV_THROW;
#endif

#if EV_IDLE_ENABLE
  EV_API_DECL void ev_idle_start( EV_P_ ev_idle * w ) EV_THROW;
  EV_API_DECL void ev_idle_stop( EV_P_ ev_idle * w ) EV_THROW;
#endif

#if EV_PREPARE_ENABLE
  EV_API_DECL void ev_prepare_start( EV_P_ ev_prepare * w ) EV_THROW;
  EV_API_DECL void ev_prepare_stop( EV_P_ ev_prepare * w ) EV_THROW;
#endif

#if EV_CHECK_ENABLE
  EV_API_DECL void ev_check_start( EV_P_ ev_check * w ) EV_THROW;
  EV_API_DECL void ev_check_stop( EV_P_ ev_check * w ) EV_THROW;
#endif

#if EV_FORK_ENABLE
  EV_API_DECL void ev_fork_start( EV_P_ ev_fork * w ) EV_THROW;
  EV_API_DECL void ev_fork_stop( EV_P_ ev_fork * w ) EV_THROW;
#endif

#if EV_CLEANUP_ENABLE
  EV_API_DECL void ev_cleanup_start( EV_P_ ev_cleanup * w ) EV_THROW;
  EV_API_DECL void ev_cleanup_stop( EV_P_ ev_cleanup * w ) EV_THROW;
#endif

#if EV_EMBED_ENABLE
  /* only supported when loop to be embedded is in fact embeddable */
  EV_API_DECL void ev_embed_start( EV_P_ ev_embed * w ) EV_THROW;
  EV_API_DECL void ev_embed_stop( EV_P_ ev_embed * w ) EV_THROW;
  EV_API_DECL void ev_embed_sweep( EV_P_ ev_embed * w ) EV_THROW;
#endif

#if EV_ASYNC_ENABLE
  EV_API_DECL void ev_async_start( EV_P_ ev_async * w ) EV_THROW;
  EV_API_DECL void ev_async_stop( EV_P_ ev_async * w ) EV_THROW;
  EV_API_DECL void ev_async_send( EV_P_ ev_async * w ) EV_THROW;
#endif

#if EV_COMPAT3
#define EVLOOP_NONBLOCK EVRUN_NOWAIT
#define EVLOOP_ONESHOT  EVRUN_ONCE
#define EVUNLOOP_CANCEL EVBREAK_CANCEL
#define EVUNLOOP_ONE    EVBREAK_ONE
#define EVUNLOOP_ALL    EVBREAK_ALL
#if EV_PROTOTYPES
  EV_INLINE void ev_loop( EV_P_ int flags ) {
    ev_run( EV_A_ flags );
  }
  EV_INLINE void ev_unloop( EV_P_ int how ) {
    ev_break( EV_A_ how );
  }
  EV_INLINE void ev_default_destroy( void ) {
    ev_loop_destroy( EV_DEFAULT );
  }
  EV_INLINE void ev_default_fork( void ) {
    ev_loop_fork( EV_DEFAULT );
  }
#if EV_FEATURE_API
  EV_INLINE unsigned int ev_loop_count( EV_P ) {
    return ev_iteration( EV_A );
  }
  EV_INLINE unsigned int ev_loop_depth( EV_P ) {
    return ev_depth( EV_A );
  }
  EV_INLINE void ev_loop_verify( EV_P ) {
    ev_verify( EV_A );
  }
#endif
#endif
#else
  typedef struct ev_loop ev_loop;
#endif

#endif

EV_CPP(
} )

#endif
